A physicalistic approach assumes that percepts can be explained by modeling the underlying physiological mechanisms. According to the phenomenological school, percepts should be understood primarily within the phenomenological domain. This approach, avoiding an abstracted reductionism, leads to interpret percepts as object of experimental studying juxta propria principia, without the exclusion of further modelistic explanations. In this paper, a case of “percept-percept coupling” in illusory brightness variation is considered as an example of phenomenological investigation that shows a causal relationship between purely endogenous perceptual dynamics.
